Fix to enable animation skipping in showElement() and hideElement() in the CSS3 animation module

Added some new tests to check animations are skipped if specified in the config - for scrollElementTo() and moveElementTo() as well as showElement() and hideElement().

Amended the existing tests so that they check whether animation occurred or not.

Made corresponding changes to the styletopleft tests to guard against regressions causing the same issue there.

Fixed the bug itself in the CSS3 module.